/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.optimize.peephole;

import proguard.classfile.*;
import proguard.classfile.editor.MethodInvocationFixer;
import proguard.classfile.util.*;
import proguard.classfile.visitor.MemberVisitor;
import proguard.optimize.info.NonPrivateMemberMarker;

/**
 * This MemberVisitor makes all class members that it visits private, unless they have been marked by a
 * NonPrivateMemberMarker. The invocations of privatized methods still have to be fixed.
 *
 * @see NonPrivateMemberMarker
 * @see MethodInvocationFixer
 * @author Eric Lafortune
 */
public class MemberPrivatizer extends SimplifiedVisitor implements MemberVisitor {
    private final MemberVisitor extraMemberVisitor;

    /**
     * Creates a new MemberPrivatizer.
     */
    public MemberPrivatizer() {
        this(null);
    }

    /**
     * Creates a new MemberPrivatizer.
     * 
     * @param extraMemberVisitor an optional extra visitor for all privatized class members.
     */
    public MemberPrivatizer(MemberVisitor extraMemberVisitor) {
        this.extraMemberVisitor = extraMemberVisitor;
    }

    // Implementations for MemberVisitor.

    public void visitProgramField(ProgramClass programClass, ProgramField programField) {
        // Is the field unmarked?
        if (NonPrivateMemberMarker.canBeMadePrivate(programField)) {
            // Make the field private.
            programField.u2accessFlags =
                AccessUtil.replaceAccessFlags(programField.u2accessFlags, ClassConstants.ACC_PRIVATE);

            // Visit the field, if required.
            if (extraMemberVisitor != null) {
                extraMemberVisitor.visitProgramField(programClass, programField);
            }
        }
    }

    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) {
        // Is the method unmarked?
        if (NonPrivateMemberMarker.canBeMadePrivate(programMethod)) {
            // Make the method private and no longer final.
            programMethod.u2accessFlags =
                AccessUtil.replaceAccessFlags(programMethod.u2accessFlags, ClassConstants.ACC_PRIVATE);

            // Visit the method, if required.
            if (extraMemberVisitor != null) {
                extraMemberVisitor.visitProgramMethod(programClass, programMethod);
            }
        }
    }
}
